Normalize torch-index leaves to lowercase before the gfx*/rocm*/cu* allowlist
matches so the canonical gfx120X-all (capital X) gets the torch 2.11 floor in
install.sh (leaf, flavor and repairable helpers). Require an installed +rocm
local tag before a rocmX.Y or non-2.11 gfx pin is judged satisfied in
setup.ps1 Get-RocmPinStaleTags and the Python _rocm_pin_family_mismatch, so an
untagged CPU/CUDA wheel never leaves the pin unapplied. Classify a leaf as CUDA
only via ^cu[0-9]: the Python _TORCH_BACKEND derivation now uses
_is_cuda_family_leaf, and install.sh brands cuda only on cu[0-9]* (unset on an
unknown /current /custom mirror leaf) so the stack probes the GPU instead of
skipping ROCm repair. Add bash, Python and PowerShell tests for capital
gfx120X-all floor, current/custom not-cuda, and untagged-wheel ROCm pins.
3b17c9bb0b